Radiotransformer



Dec. 29 1925A 1,567,757

K. J. SHSPFJElEEFQNGAJ RADI OTRANSFORMER Filed March 23, 1925 Patented Dec. 29, 1925.

UNITED STATES PATENT OFFICE.

:KENNETH JAMES SCHNEIDERMAN, OF KOKOMO, INDIANA, ASSIGNOR T KOKOMO ELECTRIC CO., 0F KOKOMO, INDIANA, A CORPORATION OF INDIANA.

RADIOTRANSFORMER.

Application filed March 23, 1923. Serial No. 627,122.

To all 'whom it may concern:

Be it known that I, KENNETH JAMES SCHNEIDERMAN, a citizen of the United States of America, residing at Kokomo, in the county of Howard and State of Indiana,

have invented certain new and useful Improvements in Radiotransformers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a transformer adapted to be used for radio reception in radio frequency circuits, wherein the currents presented to the primary winding are passed by induction to the secondary winding and delivered intensified to a detector circuit. In radio frequency amplification the incoming impulses are amplified before they are detected, and when 'audio frequency amplification is used the impulses are detected and then the low :frequency component of the current is amplified. The primary is more suitable for amplifying weak signals so that the detector is furnished with fio enough current to function, and the latter is used when the signals have already been detected and when the signals are of suflicient strength to operate a loud speaker. Since these two systems of amplification 30 possess different functions; such systems may be combined so that amplification is obtained both before and after detection, but in this application I will treat of the transformer as being used tointensify currents before delivery to a detector.

One of the objects of my invention is to provide a transformer for vary-ing inductance in the primary and secondary circuits relative to each other to better adapt its use to a wider range of wave lengths than heretofore.

Another object of this invention is to provide a transformer of the above class which admitsr of proper intensifying and tuning to resonance of wave lengths within the capacity of the transformer.

A. further object of this invention is to furnish a transformer of the above class with a shield affording an inclosure for the transformer and permitting of saidy transformer being associated with other instruments ,without its aected by the induction or inductance of electric strays of said associated instruments, or vthe induction or inductance of electric performance being strays of said transformer having any effect on the performance of the associated instruments. isolation of adjacent instruments. I A still further object of this invention 1s to provide a transformer embodying a take-apart case or shield wherein the parts are similar and interchangeable, and by standardizing other parts of the transformer, the instruments can be expeditiously and economically manufactured.

The above :are a few of. the objects attained by the construction to be hereinafter described and then claimed, and reference will now be had to the drawing, whereinl .Figure 1 is a vertical longitudinal sectional view of a transformer in accordance with this invention;

Fig. 2 is a horizontal sectional View of the same;

'Fig 3 is a vertical transverse sectional view of the transformer showing the stator and rotor of the instrument in* elevation;

Fig. 4 is a horizontal sectional yiew of a portion of the transformer showing a stopfor limiting rotor adjustment,and

VFig. 5 is a side elevation of the transformer, partly broken away andv partly in section. l.

The case or shield of the transformer comprises two similar confronting Vsubstantially semi-spherical parts 1 and 2 provided with circum erent/ial enlargements 3 in abutting relation, as shown in Figs. 2 and 5, and connected by nut-equipped bolts 4: extending through said enlargements at diametrically opposed places. Each enlargement has a base `or foot piece 5 and these base pieces are adapted to be attached to a suitable support 6 by screws 7 or other fastening means.

1 The confronting faces of the enlargements 3 are provided with annular concentric recesses 8 and 9, the recess 9 being of greater diameter than the recess 8, and in the relcess 8 is a sleeve-like stator 10, made of In other words, there is complete placed ments 3 are oscillatory co-axia-l shafts 15 and 16 having the inner ends thereof connected by a cylindrical rotor 17, made of insulationl material, pinned or otherwise connected to the shafts 15 and 16, as'at 18. The rotor 17 has the periphery thereof provided with spaced-apart circumferential grooyes 19 and in said grooves are primary windings 20, connected as at 21, with leading-in Wires 22 coiled or otherwise arranged in the case part 1 to permit of the rotor being freely oscillated in the transformer case.

The outer end of the shaft 15 hasa head 23 to limit the inward movement of said shaft and on said shaft. within the recess 9, is a stop collar 24 affording shoulders 25 either of which may engage a stop pin 26 projecting into the recess 9 from one of the casek parts 1 or 2. The stop collar2- is suitably fixed to the shaft 15, and confines the movement of the rotor 17 to an arc of approximately forty-five degrees.

The shaft 16 loosely extends through the stator 10 and the support 6 and has its lower o1' outer end provided with a dial member 27 and a linger piece 28, which permits of the rotor being adjusted relative to a pointer or demarkation on the support 6.

The case parts 1 and 2 have opposed enlargements 29 provided with binding posts 30 and 81. The inner ends of the pests 30 and 31 terminate in pockets 32 in the enlargements 29 and into which pockets the wires 14 and 22 extend and are connected to the binding posts 30 and 3l respectively.

From 'the foregoing it will be noted that the rotor 17 may be adjusted for a desired degree of inductance between the primary and secondary windings, and that with these windings inclosed by the metallic case parts there is a shield about the windings which prevents electric strays from this transv former or associated instruments from interfering with one another.

'While in the drawing there is illustrated a preferred embodiment of my invention, it is to be understood that the construction is susceptible to such changes, in size, shape and manner of assembling, as fall within the scope of the appended claims.

What I claim is 1. A transformer for radio frequency amplification comprising a take-apart case completely isolating its interior, a secondary winding supported between the parts of said casing and a primary winding adjustable relative to said secondary winding.

2. A transformer for radio frequency amplification, as called for in claim 1 wherein said case has opposed flat walls supporting binding posts for said transformer.

3. A transformer for radio frequency amplication, comprising a take-apart case, a stator placed between the parts of said case, a secondary'winding on said stator, a rotor in said stator, a primary winding on said rotor, and means supportmg said rotor for adjustment in said stator.

In testimony whereof I affix my signature.

KENNETH JAMES SCHNEIDERMAN. 

